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Relay control at low voltage. Circuit design.

Published 03.01.2012 Presenter Valerij Kharybin

Relay control at low voltage. Circuit design.
Some of various electromagnetic relays often have lower response voltage than that of the power source; other ones have higher voltage. If the former can still be used by way of series connection with limiting resistor winding, the latter are inapplicable.
Though if the response voltage is under 1.8 of the power source voltage ...